<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>更新图书</title>
</head>

<body>
    <h2>更新图书</h2>
    <form></form>
    <button id="btn">提交</button>
</body>

</html>